cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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btf_split.c (2692B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2020 Facebook */
      3#include <test_progs.h>
      4#include <bpf/btf.h>
      5
      6static char *dump_buf;
      7static size_t dump_buf_sz;
      8static FILE *dump_buf_file;
      9
     10static void btf_dump_printf(void *ctx, const char *fmt, va_list args)
     11{
     12	vfprintf(ctx, fmt, args);
     13}
     14
     15void test_btf_split() {
     16	struct btf_dump *d = NULL;
     17	const struct btf_type *t;
     18	struct btf *btf1, *btf2;
     19	int str_off, i, err;
     20
     21	btf1 = btf__new_empty();
     22	if (!ASSERT_OK_PTR(btf1, "empty_main_btf"))
     23		return;
     24
     25	btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */
     26
     27	btf__add_int(btf1, "int", 4, BTF_INT_SIGNED);	/* [1] int */
     28	btf__add_ptr(btf1, 1);				/* [2] ptr to int */
     29
     30	btf__add_struct(btf1, "s1", 4);			/* [3] struct s1 { */
     31	btf__add_field(btf1, "f1", 1, 0, 0);		/*      int f1; */
     32							/* } */
     33
     34	btf2 = btf__new_empty_split(btf1);
     35	if (!ASSERT_OK_PTR(btf2, "empty_split_btf"))
     36		goto cleanup;
     37
     38	/* pointer size should be "inherited" from main BTF */
     39	ASSERT_EQ(btf__pointer_size(btf2), 8, "inherit_ptr_sz");
     40
     41	str_off = btf__find_str(btf2, "int");
     42	ASSERT_NEQ(str_off, -ENOENT, "str_int_missing");
     43
     44	t = btf__type_by_id(btf2, 1);
     45	if (!ASSERT_OK_PTR(t, "int_type"))
     46		goto cleanup;
     47	ASSERT_EQ(btf_is_int(t), true, "int_kind");
     48	ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "int", "int_name");
     49
     50	btf__add_struct(btf2, "s2", 16);		/* [4] struct s2 {	*/
     51	btf__add_field(btf2, "f1", 3, 0, 0);		/*      struct s1 f1;	*/
     52	btf__add_field(btf2, "f2", 1, 32, 0);		/*      int f2;		*/
     53	btf__add_field(btf2, "f3", 2, 64, 0);		/*      int *f3;	*/
     54							/* } */
     55
     56	t = btf__type_by_id(btf1, 4);
     57	ASSERT_NULL(t, "split_type_in_main");
     58
     59	t = btf__type_by_id(btf2, 4);
     60	if (!ASSERT_OK_PTR(t, "split_struct_type"))
     61		goto cleanup;
     62	ASSERT_EQ(btf_is_struct(t), true, "split_struct_kind");
     63	ASSERT_EQ(btf_vlen(t), 3, "split_struct_vlen");
     64	ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "s2", "split_struct_name");
     65
     66	/* BTF-to-C dump of split BTF */
     67	dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz);
     68	if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream"))
     69		return;
     70	d = btf_dump__new(btf2, btf_dump_printf, dump_buf_file, NULL);
     71	if (!ASSERT_OK_PTR(d, "btf_dump__new"))
     72		goto cleanup;
     73	for (i = 1; i < btf__type_cnt(btf2); i++) {
     74		err = btf_dump__dump_type(d, i);
     75		ASSERT_OK(err, "dump_type_ok");
     76	}
     77	fflush(dump_buf_file);
     78	dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
     79	ASSERT_STREQ(dump_buf,
     80"struct s1 {\n"
     81"	int f1;\n"
     82"};\n"
     83"\n"
     84"struct s2 {\n"
     85"	struct s1 f1;\n"
     86"	int f2;\n"
     87"	int *f3;\n"
     88"};\n\n", "c_dump");
     89
     90cleanup:
     91	if (dump_buf_file)
     92		fclose(dump_buf_file);
     93	free(dump_buf);
     94	btf_dump__free(d);
     95	btf__free(btf1);
     96	btf__free(btf2);
     97}